I would like to put up a 160 meter loop, fed with 450ohm ladderline.
Although I have enought room, the existing trees would only provide three
supports, pretty much in the shaped of a equalaterral triangle. How well
would a three sided loop work? Should I feed it in the center of one
side?

Ed
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An approximately equilateral trianglular loop, of the same perimeter, will
not work greatly different from an approximately square loop.

The tuner settings will change a little. The radiation pattern will not
noticeably change unless actually measured. Radiating efficiency will be
slightly but not very noticeably less. Connect the feedline wherever it is
convenient. The radiation pattern will change from being crudely
omni-directional to another crudely omni-directional shape.

Reg.